Hibernate框架對mysql數據庫進行CRUD(增改改刪)

使用hibernate框架對mysql數據庫進行增刪改查

1、創建一個java工程,並且創建一個數據庫hibernate

這裏寫圖片描述

2、創建一個lib文件夾,拷貝jar包,並且build path(圈起的三個是測試jar包,編輯器有的話可以不考)

這裏寫圖片描述

3、創建hibernate配置文件hibernate.cfg.xml,這裏創建在根目錄下

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <!-- 一個sessionFactory代表數據庫的一個連接 -->
    <session-factory>
        <!-- 鏈接數據庫的用戶名 -->
        <property name="connection.username">root</property>
        <!-- 鏈接數據庫的密碼 -->
        <property name="connection.password">newstar</property>
        <!-- 鏈接數據庫的驅動 -->
        <property name="connection.driver_class">
            com.mysql.jdbc.Driver
        </property>

        <!-- 鏈接數據庫的url -->
        <property name="connection.url">
              <![CDATA[jdbc:mysql://localhost:3306/hibernate?useUnicode=true&characterEncoding=utf8]]>
        </property>
        <!-- 方言 告訴hibernate使用哪個數據庫,hibernate就會在底層拼接相應的sql語句 -->
        <property name="dialect">
            org.hibernate.dialect.MySQLDialect
        </property>
        <!-- 根據持久化類生成表的策略 validate 通過映射文件檢查持久化淚idea匹配 update hibernate每次啓動的時候,檢查表是否存在,弱國不存在,則創建,如果存在,則說明不進行任何操作 
            create hibernate每次啓動的時候,根據持久化類和映射文件生成表 create-drop hibernate每次啓動的時候,根據持久化類和映射文件生成表,之後再刪除 -->
        <property name="hbm2ddl.auto">update</property>
        <!-- 顯示sql語句(開發中寫上,方便開發觀察) -->
        <property name="show_sql">true</property>
        <!-- 映射文件, -->
        <mapping resource="com/itstar/domain/Person.hbm.xml" />
    </session-factory>



</hibernate-configuration>

4、創建持久化類

package com.itstar.domain;

import java.io.Serializable;

public class Person implements Serializable {
    private Long pid;
    private String name;
    private String password;



    public Long getPid() {
        return pid;
    }
    public void setPid(Long pid) {
        this.pid = pid;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
}

5、創建映射文Person.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
    <!-- hibernate映射文件 -->
    <class name="com.itstar.domain.Person" table="person">
        <!-- id 描述主鍵 name 屬性的名稱 column 屬性的名稱對應的表中的字段 (不寫時,默認與屬性名稱一致) length 屬性的名稱對應的表的字段長度 
            (不寫時,默認爲最大值 -->
        <id name="pid" column="pid" length="5">
            <generator class="increment"></generator>
        </id>
        <property name="name" length="20" type="java.lang.String"></property>
        <property name="password" length="20" type="java.lang.String"></property>
    </class>

</hibernate-mapping>

6、創建測試類開始測試

package com.itstar.test;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Test;

import com.itstar.domain.Person;

public class TestHibernateCRUD {
    //保存用戶
    @Test
    public void testSavePerson(){
        Configuration configuration = new Configuration();
        //在跟根目錄,不需要添加參數
        configuration.configure();
        SessionFactory sessionFactory = configuration.buildSessionFactory();
        Session session = sessionFactory.openSession();
        Transaction transaction = session.beginTransaction();
        Person person = new Person();
        person.setPid(1L);
        person.setName("張三");
        person.setPassword("123456");
        session.save(person);
        transaction.commit();
        session.close();

    }
    //查詢用戶
    @Test
    public void testGetPerson(){
        Configuration configuration = new Configuration();
        configuration.configure();
        SessionFactory sessionFactory = configuration.buildSessionFactory();
        Session session = sessionFactory.openSession();
        Person  person = (Person)session.get(Person.class, 2L);
        System.out.println(person.getName());
        session.close();
    }

    //更改用戶
    @Test
    public void testChangePerson(){
        Configuration configuration = new Configuration();
        configuration.configure();
        SessionFactory sessionFactory = configuration.buildSessionFactory();
        Session session = sessionFactory.openSession();
        Transaction transaction = session.beginTransaction();
        Person  person = (Person)session.get(Person.class, 2L);
        person.setName("李四");
        session.update(person);
        transaction.commit();
        session.close();
    }

    //刪除用戶
    @Test
    public void testDeletePerson(){
        Configuration configuration = new Configuration();
        configuration.configure();
        SessionFactory sessionFactory = configuration.buildSessionFactory();
        Session session = sessionFactory.openSession();
        Transaction transaction = session.beginTransaction();
        Person  person = (Person)session.get(Person.class, 3L);
        session.delete(person);
        transaction.commit();
        session.close();
    }

}
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